Nic Ferrier has posted a nice video tutorial on debugging Elisp. Ferrier covers the basics of instrumenting your code, stepping through it, setting breakpoints, and other edebug functions.
He also demonstrates macrostep, a package that allows you to expand and step through your macros as well. The whole video is just under 11 minutes so it’s easy to find time for it. If you write Elisp and aren’t familiar with edebug, you should definitely watch this video.